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Archived

Avalanche Forecast

Mar 27th, 2021–Mar 28th, 2021
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Snowfall and wind will ramp up the hazard through the weekend, reaching a peak Sunday afternoon.

Weather Forecast

Low pressure moving in from the NW is sending a couple of fronts our way.

Today: Flurries to 6cm. Alpine high -3. Ridgetop wind strong SW. Freezing level (Fzl) 1700m

Tonight: Snow (15cm). Low -5. Strong SW wind. Fzl 1300m

Sunday: 15-20cm of snow. Strong SW wind. High -4. Fzl 1500m

Monday: Sun and cloud mix. Low -15, High -12. Moderate W wind. Fzl 500m

Snowpack Summary

Ongoing snowfall and wind (up to 15cm in the past 24hr) has created reactive slabs. Snowfall totals of up to 55cm over the March 18th interface (this has been reactive just West of the park, on sheltered North aspects where it is surface hoar). The mid pack is strong and supportive. The below treeline snowpack has seen several melt freeze cycles.

Avalanche Summary

There were a few MIN reports of pockets of reactive windslabs on Friday, these will continue to increase in size through the weekend.

Several mid elevation natural moist slabs were observed on Thursday on all aspects.

Cornices are large and fragile and should be given a wide berth

Confidence

Forecast snowfall amounts are uncertain on Sunday

Avalanche Problems

Wind Slabs

Strong winds have created a wind slab problem in exposed areas at treeline and above. These slabs are 20-50cm thick.

  • Use caution on steep lee and cross-loaded slopes
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: North, North East, East, West, North West.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Persistent Slabs

The March 18th persistent weak layer is buried approximately 50-70cm deep as surface hoar in sheltered areas around treeline, and a suncrust on solar aspects.

  • Pay attention to overhead hazards like cornices which could trigger the persistent slab.

Aspects: North, North East, East, North West.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1.5 - 3

Storm Slabs

Storm slabs will begin to build Saturday evening, becoming the primary problem of concern by Sunday.

  • Minimize overhead exposure during periods of heavy loading from new snow, wind.
  • Use caution on open slopes and convex rolls

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 3